大整数的因子

解题思路:

注意事项:

参考代码:

#include<stdio.h>

#include<string.h>

int main()

{

             char a[100];

             int b[100];

             int flag = 0;

             scanf("%s", &a);

             int len = strlen(a);

             for (int i = 0; i < len; i++)

                 {

                      b[i] = a[i]-'0';//如果不减去 '0'，则 b 数组中存储的将是字符的 ASCII 值，而不是对应的整数值

                 }

             for (int i = 2; i <= 9; i++)

                {

                          int rest=0;//初始化

                          for (int j = 0; j < len; j++)

                              {

                                      rest = (rest * 10 + b[j]) % i;//模拟竖式的除法运算

                             }

                             if (rest == 0)

                              {

                                     printf("%d ", i);

                                     flag = 1;

                              }

                 }

             if (flag == 0)

             printf("none");

             return 0;

}